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Meltdown & Spectre Information and Discussion

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Re: Meltdown & Spectre Information and Discussion
« Reply #53 on: January 16, 2018, 09:14:04 PM »
 

TheDead

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@trinidad - I also concur that the Distrowatch article is one of the easiest on the brain! ;)
Also, I must say trinidad that you are quite the "machine" on this technical subject! ;) again.

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Re: Meltdown & Spectre Information and Discussion
« Reply #52 on: January 16, 2018, 05:00:56 PM »
 

trinidad

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This whole post was wrong. I've wortked on 38 different machines in the last four days and my head is is tired and my laptop notes completely jumbled. So far I can say that the meltdown mitigation (KPTI) has yet to roll out for LTS 32bit, and the spectre v1 mitigation has yet to roll out for Ubuntu LTS 64bit though it is in place in LL 32bit. Some 32bit machines I have tested have 800 code ops in place for Specter v1. I expect this number is excessive for big 64bit systems thus the delay. So generally : 32bit is safe from specter v1 so far, and 64bit has KPTI mitigation. Sorry for the previous error. I'm stopping for today now.   

TC
« Last Edit: January 16, 2018, 06:13:30 PM by trinidad »
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #51 on: January 16, 2018, 11:51:03 AM »
 

trinidad

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I've tested the Meltdown Spectre checker from github and the Ubuntu commands on this page and they work.

https://www.ostechnix.com/check-meltdown-spectre-vulnerabilities-patch-linux/

TC

« Last Edit: January 16, 2018, 12:17:51 PM by trinidad »
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #50 on: January 16, 2018, 11:00:01 AM »
 

newtusmaximus

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https://community.sophos.com/kb/en-us/128053 -  Its relevance to LL or  Debian distros is beyond me I am afraid.  May be of help to our "knowledgeable ones" though
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Re: Meltdown & Spectre Information and Discussion
« Reply #49 on: January 16, 2018, 09:47:18 AM »
 

trinidad

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I've read them both before Jerry. Glad Distrowatch has made the info easy to access. Spectre is a threat to high end propietary security meaures like AV and anti-malware deployments that use CPU sandboxing, and is also able to produce DOS exploits via bit flipping exploits akin to the rowhammer concept. Every existing CPU protection/monitoring gadget is open to exploit this way. It is the ultimate back door. I am avoiding being technical until I'm ready with my own conclusions.

TC 
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #48 on: January 16, 2018, 12:02:46 AM »
 

Jerry

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Re: Meltdown & Spectre Information and Discussion
« Reply #47 on: January 15, 2018, 05:25:10 PM »
 

trinidad

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Nasty little side effects. With the meltdown mitigations on both kernels .109 in Ubuntu LTS base system, and .110 in LL running in Qemu I'm running a right around a 38% increase in RAM usage with heavy IO (noted while updating from .109 to .110 in LL running in Qemu) CPU bouncing between 70% and 90%. RAM usage never exceeded 50% before.

Settled back a bit after rebooting both. Only about 15% higher that before running Firefox in both systems simultaneously.

TC
« Last Edit: January 15, 2018, 05:39:56 PM by trinidad »
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #46 on: January 15, 2018, 03:58:51 AM »
 

newtusmaximus

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Re: Meltdown & Spectre Information and Discussion
« Reply #45 on: January 15, 2018, 02:19:56 AM »
 

Jerry

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FYI - Ubuntu making some head way here:

 

Re: Meltdown & Spectre Information and Discussion
« Reply #44 on: January 13, 2018, 09:39:58 AM »
 

trinidad

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Acutally if we consider the fundamental ethical business model of the proprietary computer industry we can derive the creedo: "Don't look back. You're not going that way." though Roks take is perfectly funny too. Rush to development is what this mess is all about. I believe a cautionary approach is better, given that this flaw involves proprietary code that has such a cross platform impact and scope. The best approach would be for Intel to release open source CPU code, not expect software modification. Some say Linux in general would be better off to drag its feet a little with this issue and consider a little more in depth what the suggested mitigations might open a door to. Could be a bad moon rising.

TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #43 on: January 12, 2018, 07:10:35 PM »
 

rokytnji

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Hey T what are you on :)   All this blown your circuits??   :)

My take  and sense of humor is his clever way on how video killed my the function of my IBM T23 laptop.

Only way I can watch watch youtube on a Pentium 3 is with livestreamer tied into streamlight-antix

Quote
Livestreamer is a Command Line Interface that extracts video
streams from various services and hands them to a video player,
such as VLC. The main purpose of Livestreamer is to allow the
user to avoid buggy and CPU heavy flash plugins but still
be able to enjoy various streamed content.

Currently most of the big streaming services are supported
(e.g. Dailymotion, Livestream, Justin.tv, Twitch, YouTube Live
and UStream) and more specialized content providers can be
added easily using Livestreamerís plugin system.
Quote

streamlight-antix

Quote
An easy way to play or download antiX help videos from Youtube without using a modern, heavyweight, web browser.
Quote

Hope I guessed right.  Kinda off topic. But I don't care.  :P

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Re: Meltdown & Spectre Information and Discussion
« Reply #42 on: January 12, 2018, 06:29:02 PM »
 

newtusmaximus

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Hey T what are you on :)   All this blown your circuits??   :)
2006 - HP DC7700p ultraslim Desktop Intel 6300 cpu  4GB Ram LL3.8 64bit.
2007 - Fujitsu Siemens V3405 Laptop  2 GB Ram LL3.6 32bit. Now 32bit Debian 9 + nonfree.
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2003 - RETIRED Toshiba Satellite Pro A10 1 GB RAM LL2.8 32bit
 

Re: Meltdown & Spectre Information and Discussion
« Reply #41 on: January 12, 2018, 11:13:52 AM »
 

trinidad

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I heard you on the wireless back in fifty two
Lying awake intent at tuning in on you
If I was young it didn't stop you coming through

They took the credit for your second symphony
Rewritten by machine and new technology
And now I understand the problems you can see

Oh-a oh
I met your children
Oh-a oh
What did you tell them?

Video killed the radio star
Video killed the radio star

Pictures came and broke your heart
Oh-a-a-a oh

And now we meet in an abandoned studio
We hear the playback and it seems so long ago
And you remember the jingles used to go

Oh-a oh
You were the first one
Oh-a oh
You were the last one

Video killed the radio star
Video killed the radio star

In my mind and in my car
We can't rewind we've gone too far

Oh-a-aho oh
Oh-a-aho oh

Video killed the radio star
Video killed the radio star

In my mind and in my car
We can't rewind we've gone to far
Pictures came and broke your heart
Put the blame on VTR



Don't look back. You're not going that way.
TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #40 on: January 12, 2018, 10:24:40 AM »
 

rokytnji

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If you wanna do a quick check on your own. Just for piece of mind I guess.


Code: [Select]
dd if=/dev/zero of=/tmp/testfile bs=512 count=5000000

<use sudo in Linux Lite>
RESULT
-Ultra-slim-Desktop:~$ sudo dd if=/dev/zero of=/tmp/testfile bs=512 count=5000000
[sudo] password for linuxlite:
5000000+0 records in
5000000+0 records out
2560000000 bytes (2.6 GB, 2.4 GiB) copied, 21.1723 s, 121 MB/s
-Ultra-slim-Desktop:~$


So what does this mean in the scheme of things please?

For starters. Simple answer. 121 MB/s is OK and means no memory leak.

I have been busy changing kernels in my gear and using patched kernels from Debian and AntiX to make the point of this thread moot in my case usage.

Like on this IBM T23 Laptop that Linux Lite won't run on. Due to age of gear and hardware limitations. Posting this reply in Netsurf browser. No Java or Flashplayer Plugin touches this laptop.

Code: [Select]
[email protected]:~
$ inxi -M
Machine:   Device: laptop System: IBM product: 26474MU serial: N/A
           Mobo: IBM model: 26474MU serial: N/A
           BIOS: IBM v: 1AET64WW (1.20 ) date: 10/18/2006
h[email protected]:~
$ inxi -f
CPU:       Single core Mobile Intel Pentium III - M (-UP-) cache: 512 KB
           CPU Flags: cmov cx8 de eagerfpu fpu fxsr mca mce mmx msr mtrr pae pge pse
           pse36 sep sse tsc vme
[email protected]:~
$ uname -a
Linux biker 4.9.75-antix.2-486-smp #2 SMP Tue Jan 9 15:22:47 EST 2018 i686 GNU/Linux
[email protected]:~
$

Ubuntu will make this thread moot also when their patched kernels are available also.

Your gear is untouched from what I can tell from your readout. I'll run that command on my IBM T23 Laptop. Which is way way slower and weaker than your gear. It uses a intel cpu also though.

Code: [Select]
# dd if=/dev/zero of=/tmp/testfile bs=512 count=5000000
5000000+0 records in
5000000+0 records out
2560000000 bytes (2.6 GB, 2.4 GiB) copied, 68.3041 s, 37.5 MB/s

as you can tell from my readout I gave as a comparison. Mine is fine also for the age of this gear. If I got something like 5 MB/s. Then I'd worry. If it took like 10 mintues to copy. That would concern me also. s

 

 



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Dell XT2 > Touchscreen Laptop
Dell 755 > Desktop
Acer 150 > Desktop
I am who I am. Your approval is not needed.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #39 on: January 12, 2018, 09:53:56 AM »
 

newtusmaximus

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If you wanna do a quick check on your own. Just for piece of mind I guess.


Code: [Select]
dd if=/dev/zero of=/tmp/testfile bs=512 count=5000000

<use sudo in Linux Lite>
RESULT
-Ultra-slim-Desktop:~$ sudo dd if=/dev/zero of=/tmp/testfile bs=512 count=5000000
[sudo] password for linuxlite:
5000000+0 records in
5000000+0 records out
2560000000 bytes (2.6 GB, 2.4 GiB) copied, 21.1723 s, 121 MB/s
-Ultra-slim-Desktop:~$


So what does this mean in the scheme of things please?






« Last Edit: January 12, 2018, 09:57:22 AM by newtusmaximus »
2006 - HP DC7700p ultraslim Desktop Intel 6300 cpu  4GB Ram LL3.8 64bit.
2007 - Fujitsu Siemens V3405 Laptop  2 GB Ram LL3.6 32bit. Now 32bit Debian 9 + nonfree.
2006 - Fujitsu Siemens Si1520 Laptop Intel T720 cpu 3GB Ram   LL5.6 64 Bit
2003 - RETIRED Toshiba Satellite Pro A10 1 GB RAM LL2.8 32bit
 

 

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